<html>
    <head>
        <meta charset="utf8">
    </head>
    <body>
        <form action="/login" method="post">
            <input type="text" name="username"><br/>
            <input type="password" name="password"><br/>
            <input type="submit" value="提交" name="submit">
        </form>
    </body>
</html>
